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CHAPTER 2 THE ASP.NET REQUEST PIPELINE
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Figure 2-15. The Application Configuration dialog box from the MMC IIS snap-in From here the DOM extension must be mapped to the ISAPI extension for the ASP .NET Framework. It s easiest to copy the entire path to the DLL from an existing entry, then choose Add and paste it into the new entry, as shown in Figure 2-16.
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Figure 2-16. Configuring a new extension for a web application Now IIS knows to hand off requests arriving at the Web Server to the ASP .NET Framework. The last step to take is on the ASP .NET tab of the web application properties dialog. From here click the Edit Configuration button, then choose the Advanced tab on the dialog that appears, and the Http Handlers entry from the Section list. Choose the Add button to map *.dom to the DomHandler type, as shown in Figure 2-17.
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CHAPTER 2 THE ASP.NET REQUEST PIPELINE
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Figure 2-17. The Http Handlers section of ASP .NET configuration within the MMC IIS snap-in This tool, when used in the context of a specific IIS application, generates an entry in the web.config file of that application. From within Visual Studio .NET, open the web.config and you can see the entry the configuration tool has made: <httpHandlers> <add path="*.dom" verb="*" type="DomHandler" /> </httpHandlers> Now make a request for any file with a DOM extension from within the IIS application. The dynamically generated image using the filename should appear. This handler can now be used from within any application as the src attribute of an image tag.
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The ASP .NET Framework is a completely extensible application hosting architecture that is hosted by Internet Information Server (IIS). The main points of extensibility are pre- and post-processors in the request pipeline, and the capability to associate HTTP handlers with different URL patterns. Dozens of hooks are provided to extend the pipeline. These hooks can be trapped using either a type that inherits from HttpApplication or by implementing the IHttpModule interface.
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The global.asax is the most common way to inherit from HttpApplication, and this file is given special treatment by the Framework. Namely, its events are automatically wired. HTTP modules are set up within a specific application via the web.config file. The advantage with HTTP modules is that any number can be set up to extend the pipeline at the server level or within a specific application. The ASP .NET Framework uses dozens of these to provide a lot of built-in functionality. Finally, request processing can be customized using HttpHandlers. Again, dozens of these are used within the shipping version of the Framework to process different types of requests. Doing custom request processing is as easy as creating a type that implements the IHttpHandler interface, and there are several options for configuring a handler within an application. In the next section, we ll shift the focus from the pipeline down to the Page handler. This complex handler processes all requests for ASPX files. We ll also take a look under the hood at how the type that inherits from System.Web.UI.Page is transformed into a stream of HTML.
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Page Object Internals
ou already know from your work with ASP .NET that the Page object is your base class for all ASP.NET pages. You re probably familiar with the event life cycle of the Page object, at least the Load event and control-specific events that execute when a postback occurs. In this chapter we re going to pull back the covers on System.Web.UI.Page. We ll examine the pieces and parts of its infrastructure that allow you to interact programmatically with control objects, while still sending a stream of HTML back to the client. Sometimes the layer of abstraction between you and the stream of HTML going to the client can be frustrating. There are times you ll want to have specific control over the HTML that you re generating, and the Web Control just won t be generating the HTML quite the way you d like it to. The good news is there s nothing stopping you from exercising exactly as much control over the generated HTML as you need. With a thorough understanding of the work that the Page object does, the structure and touch-points of its control tree, and how the rendering process accomplishes its work, you have a toolset to help you greatly increase your control over the generated HTML. The Page object orchestrates the entire construction of the web page. It houses the process life cycle, the event infrastructure, and the hierarchical control tree that generates the page s HTML. In this chapter, we ll drill into these internal components of the pageprocessing infrastructure.
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